Relegated Nuneaton Town appoint Ilkeston Town boss Kevin Wilson as their new manager.
Relegated Tranmere Rovers appoint ex-Southport, Cambridge and Luton boss Gary Brabin as their new manager.
Forest Green boss Ady Pennock releases six players following their defeat by Bristol Rovers in the Conference play-offs.
Grimsby will face Bristol Rovers in the Conference promotion final at Wembley after comfortably beating Eastleigh.
Bristol Rovers beat Forest Green to secure a 3-0 aggregate victory and book their spot in the Conference promotion final.
Team news for Sunday's League One clash between Sheffield United and Chesterfield at Bramall Lane (kick-off 12:15pm).
New manager Gary Mills says he wants to see happy Wrexham players after taking over at the Conference club.
Nathan Arnold's scores two stunners to give Grimsby the advantage over Eastleigh in the Conference play-off semi-final.